lundell



A. E. LUNDELL.

SWITCH CONTROLLING SYSTEM.

APPLICATION FILED JUNE 21, 1916.

Patented Mar. 16, 1920.

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' A. E. LUNDELL.

SWITCH CONTROLLING SYSTEM.

APPLICATION FILED JUNEZI, 1916.

'1 ,334, 1 O5 Patented Mar. 16, 1920.

2 SHEETSSHEET 2.

//7 V8/7/0/ A/b en 5. L ands/A burrs? srn'rns EN OFFICE ALBEN' E.LUNDELL, OF NEXV YORK, N. L, ASSIGNOR XVESTERN ELECTRIC COMPANY,INCORPORATED, Q13 NEW YORK, N. 1., A CQR-PORATIEN OF. NEW YORK-swrronpcnrnonmne streamer.

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Specification of Letters Patent. Patented luztl'. 16, 1920.

Applicationfiled Junefll, 1916. Serial No. 105,002.

To all whom it may concern:

Be it known that I, ALBEN E. L'UNDELL, a citizen of the United States,residing at New York, in the county of Bronx and State of New York, haveinvented certain new and useful Improvements in SwitchControllingSystems, of which the following is a full,

clear, concise, and exact description.

This invention relates to a circuit arrangement for controlling theoperation of an automatic switch, and more particularly to a circuitarrangement whereby the speed of a brush-driven shaft is made to takeplace at a uniform desired rate, under the control of an electromagneticdevice.

This invention is specially adapted for use with. a switch of thestructure shown in Patent No. 1,217 ,399, granted November 20, 1917, toC. J. Hendrickson. This invention is not, however, restricted to usewith this particular structure, but may be used to govern the speed ofany desired type-of switch.

' In a switch of the type disclosed in the above mentioned application,motion is applied to a brush shaft through the action of solenoids andplungers. Rotary motion is given to the shaft by the action ofa'toothedrack on a pinion carried by the shaft, the

toothed rack carrying on one end a plunger operated by a solenoid.Vertical motion is obtained by the pull. exerted on a plunger mounteddirectly on the brush-carrying shaft by a second solenoid.

The principal feature of the invention is the provision of means forplacing the driving circuit of the shaft actuating magnet under thecontrol of an electro-magnetic speed-controlling device. 7

In a preferred embodiment of the invention, the arrangement is asfollows: at the end of the first half of each step, a slowrelease relayis actuated, and upon the completion of each full. step, the drivingcircuit maintained open until the relay releases its armature. Thisnecessitates a time interval between successive steps and insures auniform rate of advancement of the brush shaft.

Referring to the drawings, Figure 1 is a side elevation of a switchsuitable for use with this invention; Fig. 2 is a plan view, partly insection, of the same, on the line up type. ate a plunger 2, such plungercarrying a 22of Fig. 1; Fig. 3 is a circuit arrangestrip of toothedrack? This toothed rack is in engagemcntwith a pinion 1 mounted ontherotatable shaft 5. The action of this solenoid impartsrotary motion tothe shaft. Vertical motion isgiven to the shaft bya second solenoid 6,which *is arranged to operate a plunger 7 mounted in the shaft 5.

YA frame 8, pivotally and slidably mounted on studs 9 and 10, carriesatone end an armature 11, and at its other end, a pawl 12 which isarranged to engage the teeth of the rack 3 and is normally held fromengagement therewith by. the action of a spring 13.

A. similar frame 14: is provided for solenoid 6 and is also pivotallyand slidably mounted on studs 15 and 16. This frame carries an armature17 and a pawl 18, which is arranged to engage notches 19 on the brushshaft. f

Side-switch wipers 20 are arranged to swing over contact sets 21. Aratchet wheel and hinged escapement 23 supply means for electromagneticcontrol.

Spirally disposed brushes 24 are arranged about the shaft 5, and may bebrought into an operative position with relation to their respectivegroups of terminal sets 25, 26, by the rotation of said shaft.

Circuit controlling means are indicated at 38 and 89. An arm 68,carrying an .antifriction roller 64, is arranged to sucessively I rideover circular teeth. 88, thereby .alternately operating contacts Gland62 for apurposejto be described later -A magnet 27 controls the releaseof the entire switch. A pivoted armature lever 28 I I is actuatedwhenmagnet 27 is energized,iand

restorestheside switch by engaging 9. lug

29 on the toothed segment-22, the other end of the lever 28 beingarranged to engage an offset 30 on aipivoted bell crank lever 31 towithdraw a holding pawl 32 from engagement with the. toothed rack 3.This 6C"; pawl is normally spring-pressed into engagement with thetoothed rack by spring The lever 31 in operating carries with it an arm34 attached to frame 1 L, causing the withdrawal of pawl 18 from a slot19, the.

brush shaft now being free to return to normal, being restoredvertically by the act on of gravity, and in a rotary direction by theretraction of the toothed rack by the action of springs 35 and 36.

The solenoids are made subject to impulse control in the followingmanner, the con trol mec ianisn'i for the rotary solenoid only beingdescribed, since the operation of the vertical controlling means is thesame: upon the energization of the solenoid l, the armature 11 isattracted and throws the pawl 12 into engagement" with one or the teethof the rack the pawl 12 slips into a notch between adjacent teeth oi therack so that the rack carries with it the bracket 8. The motion of therack is limited to one step, since. the armature ll acts as a stop whenengages the head of solenoid 1. Upon the termination of currentllowthrough the solenoid, the armature 11 is retracted by the action or"spring 13, thus disengaging the pawl 12 from the toothed rack. Thebracket 8 is then returned to its normal position under theinfiuence ora spring 37, the spacing of the teeth on the rack being such that thepawl 12 now lies in the plane of the next tooth and is readytorcngageinent therewith on the next en-ergization of the solenoid 1.

Referring now to the circuit arrangement shown in Fig. 3, a selectorcircuit is shown, connection being extended thereto from the substationat the left through a line finder fswiteh or similar device whose brushset leaserelay to from tree pole of battery,

Winding ofrelay e2, armature and front contact of relay 41, to ground.ll pulls up and breaks the circuit of release magnet 27, which wouldotherwise be closed a?- the brush shaft ha s-made its first n10 veinent.

The subscriber now sends a series of impulses to position a brush setbelow a'sel'ected group of trunks leading toconnectors in. the desiredgroup. Upon each retraction of the armature of relay 4sl,"'a n impulseis sent through rotary solenoid from tree pole of battery, winding ofsolenoid e 5, sideswitch armsfi and its first contact, armature andfront contact of relay l2, armature and line is advanced to a connector'20, through UJOll attraction of nlun er 2 l D 7 l I moves the brushshait a half step, at which after-a time, deenergized. The retracion ofthe armature of relay i l opens the circuit of magnet 51, whichdeenergizes and releases the side-switch arms into their sec endposition.

in the second position 0 t the side switch, current is led to the 've'solenoid 52 through free pole of battery, winding of soleso noid 52,side-switch arm and its second contact, armature and back contact or"slowrelease relay contacts 62 and 39, to wound. The solenoid isenergized and time the roller i'des up on one of the teeth 3-8, breakingthe circuit of solenoid 52 and completing t 1e circuit for relay 53 fromtree pole of batery, and contacts 61 and 39,

to ground. le a 53 at once is energized and tric circui oil 1 pletedfrom grounded battery, winding of solenoid sideswitch arm 50 and itssecond contact, armature and front contact of relay 53, and con ts 61and 39, d. The shat; is moved aha at which time the roller 6% drops intoone of the notches 65, thereby opening the circuits 1 52 and relay Relayalter of solenoid a lapse of time releases its armature, againcompleting the circuit of solenoid 52 over the path first described.This mode of operation c ntinues until a brush set 60 fi -ds the teriniii ls of an idle trunk, the time interval required. after each step forthe release of 10 rel preventing the shai't from operating atundesirable speed.

The ese no gized in switch b:

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bridges the s1 tains circuit through ground. Ti licn the t. is encounterde ergized d releas third position. switc the solenoul 52 is opened, andthe sub. back contact of relay ll, to ground, In pa ill tun into nro Flcnit or the must cat s mien to sc for, a slow-release relay conta -tsirings operated in accordencen' h the successive secondary po I ishaft. said contact spring shutting the controi of said driv ing'circuit to said slou releas reiay at the conclustion oi the first halfof {no.Ch step, the driving circuit being; interrupted at the QUE-pletion o each fuli step until said relay releases its: armature.

12. In a telephone exchange system, incoming lines and outgoing lines aselector switch for interconnei-ting said lines, said switch including abrush-c rrying shaft, a

circuit thercseries of notches on said shaft, a solenoid responsive toimpulse control for imparting primary motion to said shaft, a secondsolenoid for imparting secondary motion to said shaft a driving circuitfor said secondary solenoid, a member carrying a roller traveling oversaid notches on secondary movementof said shaft, contact springsoperated by said member, a slow-release relay, said contact springsshifting the control of said driving circuit to said slow-release relaat the completion of the first half of each step, the driving circuitbeing interrupted at the completion of each full step until said rclayreleases its armature.

In Witness whereof I hereunto SHbSCl'lbe ALBEN E. LUNDELL.

